rkiscool/Task1/Task1/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Task1
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        public void Clik_Come( object a, RoutedEventArgs q)
        {
            TaskContext taskContext = new TaskContext();
            var user_ = taskContext.User.Where(u => u.Login == Login1.Text && u.Password == Password1.Password);
            if (user_.Count() != 0)
            {
                Window2 window2 = new Window2();
                window2.Show();
                window2.Close();
            }
            else
            {
                MessageBox.Show("Не правильный логин или пароль ");
            }
        }

        private void ClickReg(object sender, RoutedEventArgs e)
        {
            Window1 window1 = new Window1();
            window1.Show();
            window1.Close();
        }
    }
}